曝气对无植物波形潜流人工湿地除氮的影响  

Effect of aeration on removal efficiency of nitrogen in unplanted wavy subsurface flow constructed wetland

作　　者：楚伟伟[1] 王克科[1] 王岩[1] 

机构地区：[1]郑州大学化工与能源学院,郑州450001

出　　处：《环境工程学报》2011年第7期1548-1553,共6页Chinese Journal of Environmental Engineering

基　　金：国家"水体污染控制与治理"科技重大专项(2009ZX07210-004-02)

摘　　要：实验构建了一种波形潜流人工湿地(wavy subsurface flow constructed wetland,WSFCW)模型,并采用人工曝气手段增强其脱氮效果。选择2种曝气强度分别为100～180 mL/min和300～350 mL/min 2种曝气方式分别为第1个波形区间(1#)和第2个波形区间(2#)同时曝气以及第2个波形区间(2#)和第4个波形区间(4#)同时曝气。结果表明,选择2#和4#位置同时曝气,曝气强度为300～350 mL/min时,湿地内部DO含量较高,并且一些局部的厌氧区也变为好氧区,硝化菌活性增强,生长繁殖速度加快,氨氮去除率也有大幅的增长,从42.6%增至93.2%,去除率提高50.6%,但此时总氮去除率并未有所提高。当采用间歇曝气措施时,由于湿地内部形成了厌氧、好氧交替的环境,提高了微生物的硝化和反硝化作用能力,因而提高了湿地对总氮去除率,本实验中总氮去除率也提高到70%以上。A wavy subsurface flow constructed wetland model was constructed using artificial aeration to improve the removal efficiency of nitrogen pollutant.It selected two kinds of aeration intensity of 100~180 mL/min and 300~350 mL/min,respectively,and two aeration positions.One aeration position was at the first wave interval（1#） and the second wave interval（2#）,and the other was at the second wave interval（2#） and the fourth wave interval（4#）.The results showed that the ammonia nitrogen removal rate increased from 42.6% to 93.2% and the total nitrogen removal rate did not increase correspondingly when 2# and 4# wave interval was the simultaneous aeration position at the aeration intensity of 300~350 mL/min.The reason may be that the higher level supply of DO cause some anaerobic zone into good oxygen area,thus the nitrifying bacteria activities increased substantially.However,the total nitrogen removal rate could be raised to 70% when the intermittent aeration measure was used,owing to the formation of alternating aerobic and anaerobic environment within the wetland.

关 键 词：波形潜流人工湿地 曝气 氮去除 

分 类 号：X703[环境科学与工程—环境工程]